2 Cycle Setup on a Pipe

[Bob Pastorello]

There is also excellent tuning theory on the Bolly. AU "Bolly Book"
page...offers good explanations of the theories, and how to calculate...then
you make a 'best guess', and fly....because airborne unloading affects
motor/prop combos differently, the "ground" measurement may not be optimal
in the air.
    You can get close, but as friend Dave Lockhart (also his Dad), and
others - like Dick Hanson - have all said in the past....
    "there is no "x" number for a certain pipe/motor/prop....just too many
variables"

Bolly book here - http://www.bolly.com.au/book/Book.jsp?Chapter=6&Section=1
Read and enjoy!!!

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


----- Original Message ----- 
From: "Lance Van Nostrand" <patterndude at comcast.net>
To: <discussion at nsrca.org>
Sent: Monday, March 29, 2004 9:11 PM
Subject: Re: 2 Cycle Setup on a Pipe


> Ditch the MC carb during testing and put a regular 1.45 carb on it.  The
> bench mount it.  I have been testing AeroSlave carbon pipes for a year now
> and have a great setup for quickly getting tuning length and rpms.  I have
a
> "trombone" made from two pieces of silicon coupler with a short length of
> aluminum header pipe in between. By starting with everything extended to
the
> extremes and sliding the whole mess together I can watch a tach and take
> readings real time.  Takes about 5 min to get the numbers and then setup
the
> flying lengths.
> --Lance
>
> ----- Original Message ----- 
> From: "Brian Young" <b4598070 at yahoo.com>
> To: <discussion at nsrca.org>
> Sent: Monday, March 29, 2004 3:16 PM
> Subject: 2 Cycle Setup on a Pipe
>
>
> > I have recently been tuning on my exhaust and have a
> > basic understanding but want some more information.
> >
> > I have a Webra 1.60 w/ MC carb and a Webra pipe w/ a
> > disk baffle.
> >
> > Im gradually shortening this pipe setup hoping to hit
> > the correct length. The problem I find with this setup
> > is the MC carb doesnt lend itself to a test stand
> > since the mixture is servo controlled. So I shorten
> > pipe and fly, shorten and fly.
> >
> > The thing Im most curious about is if you had a setup
> > no one else has how do you determine a close first
> > guess for the pipe length if you want to cut down the
> > trial and error? I had a starting point but was just
> > puzzling over this.
> >
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